I heard that Carbon14 was an efficient solution

looks like a waste of space and quite far from the person no? For sure they need good eyes

So it was designed for this mine I guess?

I’m not sure there’s a lot of mine you’re going down filled up, the images I have in mind are quite the opposite, but that’s a really cool idea!

There actually is some design to stock energy this way, with weights you lift while having excess energy